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2. LAND AS SOON AS POSSIBLE.
3. EMER SHUTDOWN after landing.
9-37. SMOKE AND FUME ELIMINATION.
Smoke and/or toxic fumes within the cockpit/cabin area
May be exhausted as follows:
CAUTION
To prevent damage to helicopter, do not
jettison doors in flight above effective
translational lift.
1. VENT PULL knobs – PULL.
2. R and L DEFOG BLWR switches – ON.
3. COMPT BLWR switch – ON.
9-38. FUEL BOOST PUMP FAILURE.
In the event of fuel boost pump failure, FUEL BOOST
FAIL caution message will display. Proceed as follows:
1. FUEL BOOST switch – OFF.
2. Descend below 8,000 feet PA.
3. LAND AS SOON AS PRACTICABLE.
9-39. ELECTRICAL SYSTEM
MALFUNCTIONS.
WARNING
(CDS2) Complete loss of DC power will
result in loss of rotor rpm I ndications
and the loss of ESC fuel control system.
Therefore, engine rpm will rapidly
increase and, if not controlled, exceed
operating limits.
9-40. (OH-58D) COMPLETE LOSS OF
ELECTRICAL POWER.
In the event all electrical power is lost (loss of battery,
AC generator, or TRU, and DC generator output),
Powered flight is possible. However, NP will increase
Rapidly due to loss of both digital and analog fuel
Controls. NP cannot be monitored with manual control
Of the throttle due to the loss of systems instruments.
NOTE
During a complete electrical failure the
FADEC system will continue to operate and
control engine RPM if the PMA is
functioning properly.
LAND AS SOON AS POSSIBLE.
9-41. DC GENERATOR FAILURE – NO
OUTPUT.
A DC generator failure will be evidenced by the MFD
Displaying the caution message DC GEN FAIL. In the
Event of a DC generator failure, proceed as follows:
1. DC GEN FIELD and DC GEN RESET circuit
breakers – Check in.
2. DC GEN switch – RESET then DC GEN. Do
not hold the switch in the RESET position.
If generator output is not restored, or if generator goes
Off the line again:
9-23
TM 1-1520-248-10
3 . DC GEN switch - OFF.
4. LAND AS SOON AS PRACTICABLE.
NOTE
Following loss of the DC generator, battery
charging does not occur. Whenever the
throttle is reduced below 91% NP the TRU
is off line and all DC systems are powered
by the battery. Low battery power may result
in loss of all CDS indications, loss of
(CDS2) ESC fuel control system and
inability to motor the starter in the event of a
residual fire on shutdown.
9-42. HOT BATT 1, HOT BATT 2, OR HOT
BATT 1 & 2 CAUTION MESSAGE(S).
WARNING
If battery(ies) overheat(s) or emit(s)
noxious fumes, do not open battery
compartment door(s) until cooldown has
occurred. Battery fluid will cause
chemical burns, and an overheated
battery can cause thermal burns and may
explode.
In the event of battery overheat:
1. Affected BATT switch - OFF. If condition is
corrected, flight may be continued with the
affected battery switch off.
If condition is not corrected, proceed as follows:
2. LAND AS SOON AS POSSIBLE.
3. EMER SHUTDOWN after landing.
9-43. AC GEN FAIL CAUTION MESSAGE.
In the event of AC generator failure:
1 . AC GEN switch - OFF, then AC GEN.
If generator output is not restored or generator fails
again:
2. AC GEN switch - OFF.
3. LAND AS SOON AS PRACTICABLE.
9-44. INV FAIL CAUTION MESSAGE.
NOTE
With inverter power off, all AC powered
equipment to include instrument lighting,
and SCAS will be lost at NP speeds below
91%.
9-45. AUDIO DISTRIBUTION UNIT (ADU)
FAILURE.
A failure of the ADU will be evidenced by a failure of all
communication radios except FM-1, including (CDS2)
ATHS, COMSEC, and retransmission. Caution/warning
advisory tones and pilot remote function will also fail.
In the event of ADU failure:
1. Transmit and receive on plain FM-1.
2. LAND AS SOON AS PRACTICABLE.
9-46. EGI FAILURE.
A failure of EGI is indicated when EGI FAIL displays on
the MFD, the VSD pitch, roll and heading data displays
go blank, and SCAS disengages. If a failure of EGI is
indicated, perform the following:
1 . EGI DC circuit breaker - Out.
2. EGI DC circuit breaker - In.
3. Last known present position - Enter.
4. Execute a MANUAL EGI alignment.
If EGI functionality is not restored or fails again:
5. EGI DC circuit breaker - Out.
Flight may be continued utilizing standby instruments
for aircraft attitude and heading information.
9-47. EGI BATT LOW.
A low EGI battery voltage condition is indicated when
EGI BATT LOW displays on the MFD. If a low EGI
　
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